diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/net/ipv4.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/net/ipv4.c b/src/net/ipv4.c index b2d51ada4..465df45e0 100644 --- a/src/net/ipv4.c +++ b/src/net/ipv4.c @@ -23,8 +23,8 @@ FILE_LICENCE ( GPL2_OR_LATER ); -/* Unique IP datagram identification number */ -static uint16_t next_ident = 0; +/* Unique IP datagram identification number (high byte) */ +static uint8_t next_ident_high = 0; /** List of IPv4 miniroutes */ struct list_head ipv4_miniroutes = LIST_HEAD_INIT ( ipv4_miniroutes ); @@ -314,7 +314,6 @@ static int ipv4_tx ( struct io_buffer *iobuf, iphdr->verhdrlen = ( IP_VER | ( sizeof ( *iphdr ) / 4 ) ); iphdr->service = IP_TOS; iphdr->len = htons ( iob_len ( iobuf ) ); - iphdr->ident = htons ( ++next_ident ); iphdr->ttl = IP_TTL; iphdr->protocol = tcpip_protocol->tcpip_proto; iphdr->dest = sin_dest->sin_addr; @@ -335,6 +334,14 @@ static int ipv4_tx ( struct io_buffer *iobuf, goto err; } + /* (Ab)use the "ident" field to convey metadata about the + * network device statistics into packet traces. Useful for + * extracting debug information from non-debug builds. + */ + iphdr->ident = htons ( ( (++next_ident_high) << 8 ) | + ( ( netdev->rx_stats.bad & 0xf ) << 4 ) | + ( ( netdev->rx_stats.good & 0xf ) << 0 ) ); + /* Determine link-layer destination address */ if ( ( rc = ipv4_ll_addr ( next_hop, iphdr->src, netdev, ll_dest ) ) != 0 ) { |